Dueling Tree Steel Shooting Target Metal. With a 10percent increase in hardness our AR550 Dueling Tree Target Kit is sure to provide you with a lifetime of fun Though we still rate them to withstand the same abuse as our AR500 Dueling Tree Target Kits the added hardness provides a little extra "insurance" against early target fatigue and a definite increase in life expectancy. Don't forget to purchase a Multi Purpose Base or make your own Specifications for Spartan Armor Systems Dueling Tree AR550 6 Paddle Kit: Manufacturer: Spartan Armor Systems Color: Metal Fabric/Material: AR550 Steel AR500 Steel Quantity: 6 Depth/Thickness: 0.375 in Diameter: 6 in Features of Spartan Armor Systems Dueling Tree AR550 6 Paddle Kit: 3/8? AR550 paddles with 6? paddle face Package Contents: Spartan Armor Systems Dueling Tree AR550 6 Paddle Kit Spartan Armor Systems TTM-DT6-550: Dueling Tree AR550 6 Paddle Kit Metal